Well sometimes my instructors ask me to vocalize what I am doing / seeing to make sure I am doing the right things. Vocalizing it actuall made it easier for me to actually do the things that I am supposed to be doing. And these are great instructors who asked me to do it - including the head instructor of the pacific region.

Just trying to have a balanced view here Of course talking too much can be a big distraction, like the first case when he seemed like he was showing off to the video cam and the second case where they were kinda chit-chating.